11. Medicine Ball Russian Twist
Sit on the floor in the top position of a situp and, holding a medicine ball Opens a New Window. with both hands, extend your arms in front of you. Explosively twist your body to one side and then twist back. Alternate sides.
12. Medicine Ball Mountain Climber
Hold the med ball Opens a New Window. with both hands and get into pushup position on the floor. Drive one knee up to your chest, then quickly drive it back while you raise the opposite knee.